The lawsuit, filed by PharmaRx Pharmaceutical Inc., accuses GE Healthcare and preventing radiopharmacies from purchasing Myoview and Cardinal of Cardiolite in a "conspiracy to eliminate competition in the market for nuclear cardiac imaging agents," according to court documents.

Myoview and Cardiolite make up 85% of the cardiac imaging agent market, according to the complaint.

GE Healthcare manufactures Myoview and sells it to to independent establishments, but also distributes the agent through its own radiopharmacies, plaintiffs wrote. Cardinal operates more than 160 radiopharmacies selling both Myoview and Cardiolite, they added.

Last week the defendants filed a motion to dismiss the case entirely on the grounds that PharmaRx "has failed to state a claim for which relief can be granted because it has failed to – and cannot – allege the required elements of the antitrust violations pled," according to court documents.Read more